Powell, the BMP DDB chairman who ran the Labour account during the 1992 and 1997 general election campaigns, believes this is the only way of guaranteeing that PPBs will reach a significant proportion of the electorate.
"Parties need to be given proper access to the voting public rather than restricting them to their current ridiculous ghettos, he will say in his submission to the Electoral Commission next month.
The Commission is consulting on the reform of PPBs in a bid to give them more relevance to the UK public. Proposals being considered include a reduction in length from three minutes to 90 seconds, and giving each party a fixed amount of airtime which can be divided as the parties see fit.Ad industry trade body the Institute of Practitioners in Advertising believes PPBs should be scrapped in favour of spot ads.